(6) باب الْجَمْعِ بَيْنَ الصَّلاَتَيْنِ فِي الْحَضَرِ
Mu'adh b. Jabal reported:
The Messenger of Allah (ﷺ) combined in the expedition to Tabuk the noon prayer with the afternoon prayer and the sunset prayer with the 'Isha' prayer. He (one of the narrators) said: What prompted him to do that? He (Mu'adh) replied that he (the Holy Prophet) wanted that his Ummah should not be put to (unnecessary) hardship.
Reference: Sahih Muslim 706 b
In-book reference: Book 6, Hadith 63
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1519